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A221258
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Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
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1
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0, 64, 112, 58081, 1319409, 103489929, 4085800416, 226720727104, 10445351809532, 530909339760900, 25591483232781872, 1268920553028932644, 61970903049203536750, 3051063081822723807844, 149565983362653741790314
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..1..2..1....0..2..0....1..2..0....0..2..1....1..2..0....0..2..1....0..2..0
..0..2..0....1..2..0....0..2..2....1..2..1....1..2..0....0..2..1....1..2..0
..0..2..1....2..2..0....0..2..0....0..2..1....0..2..2....1..2..0....1..2..1
..1..2..0....0..2..1....0..2..1....0..2..0....0..2..0....0..2..1....1..2..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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